Hallucinogen use, unspecified, in remission

This code signifies a patient's history of problematic hallucinogen use that is currently in a period of sustained remission. It indicates that the individual previously met criteria for a hallucinogen use disorder but has not experienced symptoms or engaged in hallucinogen use for a clinically significant period. The specific hallucinogen involved is not documented or is unknown.

This code is appropriate when documentation clearly states a history of hallucinogen use disorder and that the patient is currently in remission, without specifying the type of hallucinogen. It is often used in follow-up appointments for substance use disorder treatment or in general medical settings when a past history of hallucinogen use in remission is relevant to the patient's overall health. Documentation should explicitly state "in remission" or similar terminology.

• Do not use this code if the patient is actively using hallucinogens or is in acute withdrawal; instead, use codes for active use or intoxication.
• If the specific hallucinogen is known (e.g., LSD, PCP), use the more specific F16.11 (hallucinogen abuse, in remission) or F16.21 (hallucinogen dependence, in remission) codes with the appropriate fourth character for the substance.
• Always review the medical record for the duration and nature of remission to ensure it meets clinical criteria for sustained remission.